benchmark-rs 0.0.7-alpha

Benchamrks for Rust libraries
Documentation 
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use std::io::ErrorKind;
use std::path::PathBuf;

/// Measure disk usage for a path
#[allow(dead_code)]
pub fn disk_usage(path: &PathBuf) -> std::io::Result<u64> {
    if !path.exists() {
        Err(std::io::Error::new(ErrorKind::Other, format!("path does not exist: [{}]", path.to_string_lossy())))
    } else {
        let mut size: u64 = 0;
        if path.is_dir() {
            let dir = std::fs::read_dir(path)?;
            for result in dir.into_iter() {
                let entry = result.unwrap();
                size = size + disk_usage(&entry.path())?;
            }
        } else if path.is_file() {
            size = size + path.metadata().unwrap().len();
        } else {
            // ignore
        }

        Ok(size)
    }
}

/// Convert disk usage to human format
#[allow(dead_code)]
pub fn to_human(size: u64) -> String {
    if size / 0x10000000000_u64 > 0 {
        format!("{:.3}T", size as f64 / 0x10000000000_u64 as f64)
    } else if size / 0x40000000_u64 > 0 {
        format!("{:.3}G", size as f64 / 0x40000000_u64 as f64)
    } else if size / 0x100000_u64 > 0 {
        format!("{:.3}M", size as f64 / 0x100000_u64 as f64)
    } else if size / 0x400_u64 > 0 {
        format!("{:.3}K", size as f64 / 0x400_u64 as f64)
    } else {
        format!("{}", size)
    }
}

#[cfg(test)]
mod tests {
    use std::path::PathBuf;
    use crate::disk_usage::{disk_usage, to_human};

    #[test]
    fn test_disk_usage() -> std::io::Result<()> {
        assert_eq!(to_human(disk_usage(&PathBuf::from("./tests/fixtures/1.5K/512"))?), "512".to_string());
        assert_eq!(to_human(disk_usage(&PathBuf::from("./tests/fixtures/1.5K/1K"))?), "1.000K".to_string());
        assert_eq!(to_human(disk_usage(&PathBuf::from("./tests/fixtures/1.5K/"))?), "1.500K".to_string());
        Ok(())
    }
}